Accurate positioning device of double-station numerical control machine tool and using method of accurate positioning device

Abstract

The invention relates to the technical field of numerical control machine tools, in particular to a precise positioning device for a double-station numerical control machine tool and a using method of the precise positioning device. The driving assembly and the positioning output assembly are installed in the machine body assembly, the ball screw is movably connected to the positioning output assembly, the positioning table is installed on the ball screw, the input end of the positioning output assembly is connected with the output end of the driving assembly, and the driving assembly is used for driving the positioning output assembly to rotate. The positioning output assembly is used for driving the ball screw to move in the vertical direction. The positioning output assembly composed of the positioning part, the locking part and the pre-tightening adjusting part is used for controlling operation of the ball screw, the pre-tightening force can be automatically detected, the locking part and the ball screw are automatically pre-tightened, the back clearance is eliminated, high-precision positioning of the double-station numerical control machine tool is guaranteed, labor input is greatly reduced, the adjusting time is shortened, and the working efficiency is improved. And efficient operation of the numerical control machine tool is facilitated.

Description

Technical Field

[0001] The present invention relates to the technical field of CNC machine tools, and in particular to a precise positioning device for a duplex CNC machine tool and a method for using the device. Background Art

[0002] The ball screw drive method has the advantages of high efficiency, high precision and good response performance. Compared with other mechanical drive methods, the behavior of the ball screw is easier to predict, which facilitates the design of the control system. In addition, the ball screw can withstand a large axial load while maintaining high precision, so it is widely used in CNC machine tools as a device for loading workpieces, controlling the movement of workpieces and accurately positioning them.

[0003] When the ball screw is not preloaded, there may be a tiny gap due to manufacturing tolerance and assembly reasons. This gap will cause the so-called "backlash" when the direction changes, that is, when the direction of movement is reversed, there will be a short unloaded moving distance between the screw and the nut. This backlash will affect the positioning accuracy of the machine tool, especially when performing precision machining. Therefore, preload adjustment is a very important optimization measure for the ball screw system. Its main purpose is to eliminate or reduce the backlash (also called reverse clearance) between the ball screw and the nut by applying a certain preload, thereby improving the rigidity and repeatability of the system. However, the existing method of adjusting the preload through double nuts requires manual repeated installation and removal of nuts and adjustment of backlash, which is troublesome. Especially for duplex CNC machine tools, because there are two sets of ball screw drive devices, manual adjustment is more troublesome. Moreover, the load of duplex CNC machine tools is large, and the same power device needs to control two sets of ball screws to run simultaneously, the output power is large, and the heat generation is serious. The simultaneous operation of two sets of ball screws will also generate more friction heat, large mechanical vibration, and more likely to produce reverse clearance.

[0004] Therefore, a device can be designed to detect the backlash between the ball screw and the nut and automatically adjust the preload force, so that the duplex CNC machine tool can maintain high-precision positioning under high load conditions. Summary of the invention

[0005] In order to overcome the serious heating of the ball screw drive structure of the duplex CNC machine tool, the ball screw is more likely to produce backlash, and it is troublesome to adjust the preload force manually.

[0006] The technical solution of the present invention is: a duplex CNC machine tool precision positioning device, comprising a body component, a driving component and a positioning output component installed in the body component, a ball screw movably connected to the positioning output component, and a positioning platform installed on the ball screw, the input end of the positioning output component is connected to the output end of the driving component, the driving component is used to drive the positioning output component to rotate, and the positioning output component is used to drive the ball screw to move in the vertical direction; the positioning output component comprises a positioning part, a locking part movably connected to the positioning part, and a pre-tightening adjustment part arranged on the positioning part, the pre-tightening adjustment part is used to drive the locking part to approach or move away from the positioning part, and the pre-tightening adjustment part is provided inside Lubricating grease, when the locking part is away from the positioning part, the lubricating grease flows into the back clearance between the positioning output assembly and the ball screw; an air blower assembly and a transmission assembly are installed in the body assembly, a brush head is installed on the transmission assembly, the input end of the air blower assembly is connected to the output end of the transmission assembly, the input end of the transmission assembly is connected to the output end of the drive assembly, the drive assembly drives the air blower assembly to rotate through the transmission assembly, and the air blower assembly is used to accelerate the air flow in the body assembly; an infusion assembly is installed in the body assembly, the infusion assembly is connected to the brush head, the input end of the infusion assembly is connected to the output end of the transmission assembly, a coolant is provided in the infusion assembly, and the coolant can flow between the liquid cylinder assembly and the brush head.

[0007] Preferably, the body assembly includes a power bin, a vertical cylinder mounted on the power bin and two lifting bins, the positioning output assembly has two and both are movably connected in the corresponding lifting bins, the ball screws are respectively arranged in the corresponding lifting bins, and the positioning output assembly is used to drive the ball screw to move along the axial direction of the lifting bin; the driving assembly includes a motor mounted on the power bin, a plurality of driving wheels movably connected in the power bin, a belt movably connected between the plurality of driving wheels and a synchronous main gear fixedly mounted on one of the driving wheels, the other driving wheel is mounted on the output end of the motor, the motor drives the synchronous main gear to rotate through the driving wheel and the belt, the input end of the positioning output assembly is connected to the synchronous main gear, and the synchronous main gear is used to drive the positioning output assembly to rotate.

[0008] Preferably, the positioning part includes a positioning nut movably connected to the lifting warehouse, a synchronous sub-gear arranged on the positioning nut and a guide groove opened on the positioning nut, and the synchronous sub-gear is meshed with the synchronous main gear; the locking part includes a locking nut movably connected to the positioning nut and a guide block fixedly connected to the locking nut, the guide block is movably connected in the guide groove, and the synchronous main gear drives the positioning nut and the locking nut to rotate through the synchronous sub-gear; the preload adjustment part includes an air cavity opened on the positioning nut, a tension sensor installed in the air cavity, a signal spring with one end connected to the tension sensor, a plunger movably connected to the air cavity, and a tensile spring fixedly connected to the plunger. A spring, an air pump installed on the positioning nut, a fluid replenishment tube with one end connected to the air cavity and an electric valve installed on the fluid replenishment tube, the plunger divides the air cavity into two independent spaces, one of which is connected to the air pump, and the lubricating grease is arranged in the other space, one end of the fluid replenishment tube is connected to the space where the lubricating grease is located, and the other end is connected to the back clearance between the locking nut and the ball screw, the plunger is fixedly connected to the guide block, and the gas flows between the air cavity and the air pump. The tension sensor is used to detect the tension value of the signal spring. When the gas flows into the air cavity, the plunger drives the locking nut away from the positioning nut through the guide block, and the tension sensor detects that the tension value of the signal spring reaches F1.

[0009] Preferably, the blower assembly includes a driven gear movably connected in the power bin and fan blades fixedly mounted on the driven gear, the driven gear is connected to the output end of the transmission assembly, and the transmission assembly drives the fan blades to rotate via the driven gear; the transmission assembly includes a transmission column movably connected in the power bin, a transmission flat gear ring fixedly connected to the transmission column, a transmission bevel gear ring arranged on the transmission flat gear ring, a first transmission bevel gear movably connected in the power bin, a transmission flat gear and a second transmission bevel gear fixedly connected to the first transmission bevel gear, the transmission flat gear ring is meshed with the synchronous main gear, the first transmission bevel gear is meshed with the transmission bevel gear ring, the synchronous main gear is used to drive the transmission column, the transmission flat gear ring and the transmission bevel gear ring to rotate, the transmission bevel gear ring is used to drive the first transmission bevel gear, the transmission flat gear and the second transmission bevel gear to rotate, the driven gear is meshed with the transmission flat gear, and the transmission flat gear drives the fan blades to rotate via the driven gear.

[0010] Preferably, the infusion component includes a liquid cavity mounted on the body component, a drainage component movably connected in the liquid cavity, and a follower component movably connected to the drainage component, the input end of the follower component is connected to the output end of the transmission component, the transmission component is used to drive the follower component to rotate, and the follower component is used to drive the drainage component to move in the liquid cavity, an infusion tube is movably connected between the liquid cavity and the transmission column, and a channel is provided between the transmission column and the brush head, and when the drainage component moves in the liquid cavity, the coolant flows between the liquid cavity and the brush head through the infusion tube

[0011] Preferably, the discharge assembly includes a shaft plug movably connected in the liquid chamber, a return spring installed on the shaft plug and a spiral track installed in the shaft plug, one end of the return spring is connected to the shaft plug, and the other end is connected to the liquid chamber, when the shaft plug moves downward, the coolant flows from the liquid chamber into the brush head through the infusion tube; when the shaft plug moves upward, the coolant flows from the brush head into the liquid chamber through the infusion tube; the follower assembly includes a rotating shaft movably connected in the shaft plug, a wheel frame fixedly connected to one end of the rotating shaft and a bevel gear seat fixedly connected to the other end of the rotating shaft, the wheel frame can move along the spiral track, the bevel gear seat is meshed with the transmission bevel gear ring, the transmission bevel gear ring is used to drive the bevel gear seat, the rotating shaft and the wheel frame to rotate, and the wheel frame drives the shaft plug to move in the liquid chamber through the spiral track.

[0012] Preferably, a linkage component is installed in the body component, the input end of the linkage component is connected to the output end of the transmission component, the transmission component is used to drive the linkage component to move in the body component, an adjustment component is installed on the body component, the input end of the adjustment component is connected to the output end of the linkage component, an exhaust component is installed on the adjustment component, the adjustment component is used to drive the exhaust component to move, and gas flows between the body component and the exhaust component.

[0013] Preferably, the linkage assembly includes a linkage bevel gear movably connected in the power bin, a linkage flat gear fixedly connected to the linkage bevel gear, a rocker arm with one end movably connected to the eccentric position of the linkage flat gear, a support rod movably connected to the other end of the rocker arm and a plug installed on the support rod, the linkage bevel gear is meshed with the second transmission bevel gear, the second transmission bevel gear is used to drive the linkage bevel gear and the linkage flat gear to rotate, the linkage flat gear is used to drive the rocker arm to swing, the plug is movably connected in the vertical tube, and the rocker arm drives the plug to move in the vertical tube through the support rod; the exhaust assembly includes a rotating arm movably connected to the vertical tube, an input bevel gear and an air outlet plate installed on the rotating arm, and an air supply pipe with one end connected to the air outlet plate, and the other end of the air supply pipe is connected to the vertical tube; when the plug moves downward, the gas flows from the vertical tube into the air outlet plate through the air supply pipe; when the plug moves upward, the gas flows from the air outlet plate into the vertical tube through the air supply pipe.

[0014] Preferably, the adjusting assembly includes a first input spur gear movably connected in the power bin, a second input spur gear fixedly connected to the first input spur gear, an output spur gear movably connected in the power bin and an output bevel gear fixedly connected to the output spur gear, the first input spur gear is meshed with the linkage spur gear, the second input spur gear is meshed with the output spur gear, the output bevel gear is meshed with the input bevel gear, the linkage spur gear is used to drive the first input spur gear and the second input spur gear to rotate, the second input spur gear is used to drive the output spur gear and the output bevel gear to rotate, and the output bevel gear drives the rotating arm to rotate via the input bevel gear.

[0015] A method for precise positioning of a duplex CNC machine tool, using a precise positioning device for a duplex CNC machine tool as described above, comprises the following steps:

[0016] S1: Start the air pump, and input the air in the environment into the air cavity through the air pump. The pressure in the air cavity increases, forcing the plunger to overcome the elastic force of the tension spring and move downward. The plunger drives the guide block to slide in the guide groove, and makes the locking nut further away from the positioning nut, so that the back clearance between the ball in the positioning nut and the ball screw gradually decreases. At the same time, the electric valve opens, and the plunger pushes the lubricating grease in another space of the air cavity into the gap between the locking nut and the ball screw through the liquid filling tube, thereby increasing the lubrication of the ball rolling on the ball screw.

[0017] S2: until the backlash between the ball and the ball screw is reduced to a preset range, the tension sensor detects that the tension value of the signal spring reaches F1, and the tension sensor feeds back a signal to the control unit of the air pump and the electric valve, the air pump stops pumping gas, and the electric valve closes;

[0018] S3: Place the workpiece to be processed on the corresponding positioning table, start the motor, and the motor controls one of the driving wheels to rotate, cooperates with the belt and other driving wheels, controls the synchronous main gear to rotate continuously, and the synchronous main gear transmits power to the positioning output components in the two lifting bins at the same time. Through the meshing transmission of the synchronous main gear and the synchronous sub-gear, the positioning nut is controlled to rotate continuously. Under the limited state formed by the guide block and the guide groove, the locking nut rotates with the positioning nut, driving the two ball screws to lift in the lifting bin at the same time;

[0019] S4: Synchronous with S3, the synchronous main gear is connected by meshing with the transmission flat gear ring to control the transmission column, the transmission flat gear ring and the transmission bevel gear ring to rotate around the same axis. The transmission bevel gear ring transmits power to the first transmission bevel gear to control the first transmission bevel gear, the transmission flat gear and the second transmission bevel gear to rotate around the same axis. The transmission flat gear controls the high-speed rotation of the fan blades through meshing with the driven gear, accelerates the air flow in the power compartment, and cools down the various parts of the drive assembly. At the same time, it can also have the effect of wind dust removal on the belt;

[0020] S5: Synchronous with S4, the transmission bevel gear ring transmits power to the bevel gear seat, controls the bevel gear seat, the rotating shaft and the wheel frame to rotate around the same axis, and the wheel frame moves along the spiral track during rotation. The helical structure of the spiral track forces the shaft plug to overcome the elastic force of the return spring and reciprocate in the liquid cavity. When the shaft plug moves downward, the coolant in the liquid cavity is transported to the transmission column through the infusion tube, and then flows from the transmission column into the hollow brush head. The heat generated by the friction of the belt operation is absorbed by the contact and proximity between the brush head and the belt;

[0021] S6: Synchronous with S4, the second transmission bevel gear controls the linkage flat gear to rotate together through meshing transmission with the linkage bevel gear. The linkage flat gear drives the rocker arm to swing continuously, and the rocker arm generates continuous push and pull force on the support rod. When the plug moves downward in the vertical tube, the air in the vertical tube flows into the air outlet plate through the air supply pipe, and then is discharged from the air outlet plate and blows to the rising ball screw to blow away the dust on its surface;

[0022] S7: Synchronous with S6, the input bevel gear is connected with the first input spur gear through meshing, controls the rotation of the first input spur gear and the second input spur gear, and then the second input spur gear rotates to transmit power to the output spur gear, the output spur gear rotates together with the output bevel gear, the output bevel gear transmits power to the linked spur gear meshing with it, controls the swing arm to swing upward, and makes the air outlet on the air outlet plate face the rising ball screw;

[0023] S8: After the workpiece is lifted to the preset height, the motor stops running. At this time, the positioning table and the workpiece are accurately positioned at the corresponding heights, and the CNC machine tool processes the workpieces on the two positioning tables at the same time;

[0024] S9: After the workpiece processing is completed, the tension sensor detects the tension value of the signal spring again. At this time, there are two situations. One of the situations is: if the tension value is still F1, the motor is directly started, and the power is output in the opposite direction through the synchronous main gear to control the positioning nut and the locking nut to rotate together, driving the two ball screws to descend in the lifting bin at the same time until the workpiece reaches the preset position; the other situation is: if the tension value is not detected to be F1, the steps of S1 are repeated, and the locking nut is controlled to be away from the positioning nut again, so that the gap between the ball in the positioning nut and the wire rail on the ball screw is reduced to the preset range again, until the tension value is detected to be F1, and then the motor is started to drive the two ball screws to descend in the lifting bin at the same time until the workpiece reaches the preset position;

[0025] S10: When the ball screw is descending, the steps of S4-S6 are repeated. Meanwhile, according to the method of S7, the input bevel gear outputs power step by step to control the swing arm to swing downward, so that the air outlet on the air outlet plate faces the descending ball screw.

[0026] Beneficial effects of the present invention:

[0027] 1. The ball screw operation is controlled by the positioning output assembly composed of the positioning part, the locking part and the preload adjustment part. During the operation, especially before the reverse operation, the preload force can be automatically detected, and the locking part and the ball screw can be automatically preloaded according to the preset preload force value to eliminate the backlash and ensure the high-precision positioning of the duplex CNC machine tool. Compared with manual preload adjustment, it greatly reduces labor input and adjustment time, which is conducive to the efficient operation of the CNC machine tool;

[0028] 2. While adjusting the preload force through the power of the preload adjustment unit, lubricating grease can also be input into the gap between the ball screw and the locking unit simultaneously, which can reduce the friction resistance between the ball and the ball screw, and can also alleviate the heating of the ball screw during operation and reduce heat transfer;

[0029] 3. By injecting lubricating grease each time pre-tightening, the mechanical wear between the ball and the ball screw can be reduced, and the possibility of backlash caused by wear and resulting in poor positioning accuracy can be reduced;

[0030] 4. Through the brush head set on the transmission component, the dust on the belt can be cleaned during the operation of the drive component to ensure the smooth operation of the belt;

[0031] 5. Through the setting of the infusion component, the coolant can be synchronously delivered to the brush head during the operation of the drive component. Through the heat transfer effect, it is convenient to absorb the working heat generated by the operation of the drive component and other components. Especially for the belt, it can effectively reduce the possibility of aging due to long-term hot work;

[0032] 6. Through the setting of the air blowing component, the brush head can output air flow while cleaning the belt, which can enhance the cleaning effect and accelerate the flow of surrounding air, which is helpful for heat dissipation in the power compartment;

[0033] 7. Through the setting of linkage components and exhaust components, the air flow can be output synchronously during the movement of the ball screw to blow away the dust attached to the ball screw, so as to avoid the dust increasing the friction resistance between the ball screw and the ball and reduce mechanical wear;

[0034] 8. The adjustment component can be used to automatically adjust the air outlet direction along with the running direction of the ball screw while the exhaust component outputs the air flow, to ensure that the air flow always acts on the ball screw, thereby ensuring the cleaning effect of blowing away the dust on the ball screw. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 Shown is a schematic diagram of the three-dimensional structure of the double-station CNC machine tool precision positioning device of the present invention;

[0036] Figure 2 What is shown is a schematic diagram of the first cross-sectional structure of the double-station CNC machine tool precision positioning device of the present invention;

[0037] Figure 3 The second cross-sectional structure diagram of the double-station CNC machine tool precision positioning device of the present invention is shown;

[0038] Figure 4Shown is a schematic diagram of the structure of the driving component and positioning output component of the duplex CNC machine tool precision positioning device of the present invention;

[0039] Figure 5 Shown is a schematic diagram of the positioning output assembly and ball screw structure of the duplex CNC machine tool precision positioning device of the present invention;

[0040] Figure 6 Shown is a schematic diagram of the structure of the driving assembly, the blast assembly, the transmission assembly and the brush head of the duplex CNC machine tool precision positioning device of the present invention;

[0041] Figure 7 Shown is a schematic diagram of the structure of the transmission assembly and the infusion assembly of the double-station CNC machine tool precision positioning device of the present invention;

[0042] Figure 8 Shown is a schematic diagram of the structure of the linkage assembly, exhaust assembly and adjustment assembly of the duplex CNC machine tool precision positioning device of the present invention;

[0043] Fig. 9 The display is the double-station CNC machine tool precision positioning device of the present invention Figure 2 The enlarged schematic diagram at A in the middle;

[0044] Fig.10 The display is the double-station CNC machine tool precision positioning device of the present invention Figure 5 The enlarged schematic diagram of point B in the middle;

[0045] Fig.11 The display is the double-station CNC machine tool precision positioning device of the present invention Figure 3 The enlarged schematic diagram at C in the middle;

[0046] Fig.12 The display is the double-station CNC machine tool precision positioning device of the present invention Figure 3 Enlarged schematic diagram at point D in the middle.

[0047] Description of the reference numerals: 101, power bin; 102, vertical cylinder; 103, lifting bin; 201, motor; 202, driving wheel; 203, belt; 204, synchronous main gear; 301, positioning nut; 302, synchronous sub-gear; 303, locking nut; 304, guide groove; 305, guide block; 306, signal spring; 307, tension sensor; 308, air cavity; 309, plunger; 310, extension spring; 311, air pump; 312, infusion tube; 313, electric valve; 401, ball screw; 501, positioning table; 601, driven gear; 602, fan blade; 701, transmission column; 702, transmission flat gear ring; 703, transmission bevel gear ring; 70 4. First transmission bevel gear; 705. Transmission flat gear; 706. Second transmission bevel gear; 801. Brush head; 901. Liquid chamber; 902. Shaft plug; 903. Return spring; 904. Rotating shaft; 905. Wheel frame; 906. Spiral track; 907. Bevel gear seat; 908. Infusion tube; 1001. Linkage bevel gear; 1002. Linkage flat gear; 1003. Rocker arm; 1004. Support rod; 1005. Plug; 1101. Rotating arm; 1102. Input bevel gear; 1103. Air outlet plate; 1104. Air supply tube; 1201. First input flat gear; 1202. Second input flat gear; 1203. Output flat gear; 1204. Output bevel gear. DETAILED DESCRIPTION

[0048] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0049] See also Figure 1-Figure 12The present invention provides an embodiment: a duplex CNC machine tool precision positioning device, comprising a body component, a driving component and a positioning output component installed in the body component, a ball screw 401 movably connected to the positioning output component, and a positioning platform 501 installed on the ball screw 401, wherein the input end of the positioning output component is connected to the output end of the driving component, the driving component is used to drive the positioning output component to rotate, and the positioning output component is used to drive the ball screw 401 to move in the vertical direction; the positioning output component comprises a positioning part, a locking part movably connected to the positioning part, and a pre-tightening adjustment part arranged on the positioning part, the pre-tightening adjustment part is used to drive the locking part to approach or move away from the positioning part, and lubricating grease is arranged in the pre-tightening adjustment part. When the locking part moves away from the positioning part, the pre-tightening adjustment part is provided with lubricating grease. When the positioning part is in operation, the lubricating grease flows into the back clearance between the positioning output component and the ball screw 401; an air blower component and a transmission component are installed in the body component, a brush head 801 is installed on the transmission component, the input end of the air blower component is connected to the output end of the transmission component, the input end of the transmission component is connected to the output end of the drive component, the drive component drives the air blower component to rotate through the transmission component, and the air blower component is used to accelerate the air flow in the body component; an infusion component is installed in the body component, the infusion component is connected to the brush head 801, the input end of the infusion component is connected to the output end of the transmission component, a coolant is provided in the infusion component, and the coolant can flow between the liquid cylinder component and the brush head 801, the workpiece to be processed is placed on the corresponding positioning table 501, and the workpiece is placed on the CNC machine. Before the bed is started, the pre-tightening adjustment part detects the stress value between the positioning part and the locking part, and controls the pre-tightening force between the locking part and the ball screw 401 according to the detected stress value. During the adjustment process, the lubricating grease in the pre-tightening adjustment part is synchronously pressed into the back clearance between the positioning output component and the ball screw 401. After the pre-tightening force is adjusted, the driving component starts to start and outputs power to the positioning output component. The positioning output component uses the transmission effect between the positioning part and the locking part and the ball screw 401 (the groove on the ball screw 401 and the positioning part and the locking part have a large number of ball-assisted transmissions) to control the ball screw 401 to rise or fall (drive the workpiece to move to the specified position for processing or loading and unloading). During the movement of the ball screw 401, the driving component also synchronously outputs power to the transmission component, and the transmission component controls the operation of the blower component and the infusion component. The blower component accelerates the air flow in the body component, improves the heat dissipation effect of the driving component and the transmission component, and discharges the friction heat generated during the load operation of the ball screw 401 and transmitted to the body component as soon as possible. The infusion component discharges coolant into the brush head 801, and while the brush head 801 cleans and removes dust from the driving component, it further absorbs the heat generated by the driving component, assists in cooling, reduces the transfer of working heat to the ball screw 401 and the positioning output component, and reduces the adverse effects on the operation of the ball screw 401 and the adjustment of the preload force.

[0050] See also Figure 1-Figure 6 and Fig. 9 In this embodiment, the body assembly includes a power bin 101, a vertical cylinder 102 installed on the power bin 101 and two lifting bins 103. The positioning output assembly has two and both are movably connected in the corresponding lifting bins 103. The ball screws 401 are respectively arranged in the corresponding lifting bins 103. The positioning output assembly is used to drive the ball screws 401 to move along the axis direction of the lifting bin 103; the driving assembly includes a motor 201 installed on the power bin 101, a plurality of driving wheels 202 movably connected in the power bin 101, a belt 203 movably connected between the plurality of driving wheels 202, and a synchronous main gear 204 fixedly installed on one of the driving wheels 202. The other driving wheel 202 is installed on the output end of the motor 201. The motor 201 is connected to the power bin 101 through the belt 203. The synchronous main gear 204 is driven to rotate through the driving wheel 202 and the belt 203, and the input end of the positioning output component is connected to the synchronous main gear 204. The synchronous main gear 204 is used to drive the positioning output component to rotate. The motor 201 directly outputs power to a driving wheel 202, and then through the friction connection between the belt 203 and the driving wheel 202 and other driving wheels 202, all the driving wheels 202 are driven to rotate (it is worth noting that: the driving components are all installed in the power warehouse 101 in this solution, and are not limited to their installation positions in actual applications, as long as they have the same power output effect), thereby causing the synchronous main gear 204 to rotate and output power to the positioning output component, and the positioning output component controls the ball screw 401 to move in the lifting warehouse 103.

[0051] See also Figure 1-Figure 5 and Figure 9-10In this embodiment, the positioning part includes a positioning nut 301 movably connected to the lifting compartment 103, a synchronous sub-gear 302 arranged on the positioning nut 301, and a guide groove 304 opened on the positioning nut 301, and the synchronous sub-gear 302 is meshed with the synchronous main gear 204; the locking part includes a locking nut 303 movably connected to the positioning nut 301 and a guide block 305 fixedly connected to the locking nut 303, and the guide block 305 is movably connected in the guide groove 304, and the synchronous main gear 204 drives the positioning nut 301 and the locking nut 303 to rotate through the synchronous sub-gear 302;The preload adjustment unit includes an air cavity 308 provided on the positioning nut 301, a tension sensor 307 installed in the air cavity 308, a signal spring 306 connected at one end to the tension sensor 307, a plunger 309 movably connected in the air cavity 308, a tension spring 310 fixedly connected to the plunger 309, an air pump 311 installed on the positioning nut 301, a liquid replenishing tube 312 connected at one end to the air cavity 308, and an electric valve 313 installed on the liquid replenishing tube 312. The plunger 309 divides the air cavity 308 into two independent spaces, one of which is connected to the air pump 311, and the lubricating grease is arranged in the other space. One end of the liquid replenishing tube 312 is connected to the space where the lubricating grease is located. , the other end is connected to the back clearance between the locking nut 303 and the ball screw 401, the plunger 309 is fixedly connected to the guide block 305, the gas flows between the air cavity 308 and the air pump 311, the tension sensor 307 is used to detect the tension value of the signal spring 306, when the gas flows into the air cavity 308, the plunger 309 drives the locking nut 303 away from the positioning nut 301 through the guide block 305, and the tension sensor 307 detects that the tension value of the signal spring 306 reaches F1, when the tension sensor 307 detects that the tension value of the signal spring 306 is less than F1, the air pump 311 is started, and the air in the environment is pumped into the air cavity 308 through the air pump 311, so that the air in the air cavity 308 The increased pressure forces the plunger 309 to overcome the elastic force of the tension spring 310 and move downward, thereby driving the guide block 305 to slide in the guide groove 304, so that the locking nut 303 moves further away from the positioning nut 301, so that the back clearance between the ball in the positioning nut 301 and the ball screw 401 gradually decreases (the inner wall of the locking nut 303 will force the ball to fit the ball screw 401 as much as possible, so the back clearance will be reduced, which is consistent with the principle of adjusting the preload force of the existing double nuts). At the same time, the electric valve 313 is opened, and during the movement of the plunger 309, the lubricating grease in the air cavity 308 is pushed into the gap between the locking nut 303 and the ball screw 401 through the liquid replenishing tube 312, and the lubricating oil is The grease cools and lubricates the surface of the ball screw 401 and the ball, reduces the mechanical wear and the generation of working heat during operation, and reduces the adverse effects of mechanical wear and working heat on the preload (the generation of mechanical wear will further expand the backlash, resulting in the failure of the preload, and the working heat will increase the degree of mechanical wear), until the backlash between the ball and the ball screw 401 is reduced to a preset range (reaching the preset preload value), at which time the tension sensor 307 detects that the tension value of the signal spring 306 reaches F1, and the tension sensor 307 feeds back a signal to the control unit of the air pump 311 and the electric valve 313, the air pump 311 stops pumping gas, and the electric valve 313 is closed. ;

[0052] See also Figure 3 and Figure 6-Figure 7In this embodiment, the blower assembly includes a driven gear 601 movably connected to the power bin 101 and a fan blade 602 fixedly installed on the driven gear 601. The driven gear 601 is connected to the output end of the transmission assembly, and the transmission assembly drives the fan blade 602 to rotate through the driven gear 601; the transmission assembly includes a transmission column 701 movably connected to the power bin 101, a transmission flat gear ring 702 fixedly connected to the transmission column 701, a transmission bevel gear ring 703 arranged on the transmission flat gear ring 702, and a first transmission bevel gear 704 movably connected to the power bin 101. , a transmission flat gear 705 and a second transmission bevel gear 706 are fixedly connected to the first transmission bevel gear 704, the transmission flat gear ring 702 is meshed with the synchronous main gear 204, the first transmission bevel gear 704 is meshed with the transmission bevel gear ring 703, the synchronous main gear 204 is used to drive the transmission column 701, the transmission flat gear ring 702 and the transmission bevel gear ring 703 to rotate, the transmission bevel gear ring 703 is used to drive the first transmission bevel gear 704, the transmission flat gear 705 and the second transmission bevel gear 706 to rotate, the driven gear 601 is meshed with the transmission flat gear 705, the transmission flat gear ring 703 is meshed with the synchronous main gear 204, the first transmission bevel gear 704 is meshed with the transmission bevel gear ring 703, the synchronous main gear 204 is used to drive the transmission column 701, the transmission flat gear ring 702 and the transmission bevel gear ring 703 to rotate, the transmission bevel gear ring 703 is used to drive the first transmission bevel gear 704, the transmission flat gear 705 and the second transmission bevel gear 706 to rotate, The wheel 705 drives the fan blade 602 to rotate through the driven gear 601. The synchronous main gear 204 controls the transmission column 701, the transmission flat gear ring 702 and the transmission bevel gear ring 703 to rotate around the same axis through the meshing connection with the transmission flat gear ring 702. The transmission bevel gear ring 703 is meshed with the first transmission bevel gear 704 to control the first transmission bevel gear 704, the transmission flat gear 705 and the second transmission bevel gear 706 to rotate around the same axis. The transmission flat gear 705 controls the fan blade 602 to rotate at high speed through the meshing transmission effect with the driven gear 601. Rotation accelerates the air flow in the power bin 101, and air-cools various parts of the driving assembly (mainly the belt 203, because the belt 203 transmission is easily aged by heat. Once it breaks, it is easy to cause equipment failure and workpiece falling). At the same time, it can also have the effect of wind dust removal on the belt 203 (while the transmission flat gear ring 702 is rotating, the brush head 801 passes intermittently on the surface of the belt 203 to clean the dust. The brush head 801 can adopt a structure with dense soft bristles and can have good thermal conductivity, such as using materials such as silicone).

[0053] See also Figure 3 , Figure 6-Figure 7 and Fig.11In this embodiment, the infusion component includes a liquid cavity 901 installed on the body component, a drainage component movably connected in the liquid cavity 901, and a follower component movably connected to the drainage component, the input end of the follower component is connected to the output end of the transmission component, the transmission component is used to drive the follower component to rotate, and the follower component is used to drive the drainage component to move in the liquid cavity 901, and an infusion tube 908 is movably connected between the liquid cavity 901 and the transmission column 701, and a channel is provided between the transmission column 701 and the brush head 801. When the drainage component moves in the liquid cavity 901, the coolant flows between the liquid cavity 901 and the brush head 801 through the infusion tube 908; the drainage component includes a shaft plug 9 movably connected in the liquid cavity 901 02. A return spring 903 installed on the shaft plug 902 and a spiral track 906 installed in the shaft plug 902. One end of the return spring 903 is connected to the shaft plug 902, and the other end is connected to the liquid cavity 901. When the shaft plug 902 moves downward, the coolant flows from the liquid cavity 901 into the brush head 801 through the infusion tube 908; when the shaft plug 902 moves upward, the coolant flows from the brush head 801 into the liquid cavity 901 through the infusion tube 908; the follower assembly includes a rotating shaft 904 movably connected to the shaft plug 902, a wheel frame 905 fixedly connected to one end of the rotating shaft 904, and a bevel gear seat 907 fixedly connected to the other end of the rotating shaft 904. The wheel frame 905 can move along the spiral track 906 The bevel gear seat 907 is meshed with the transmission bevel gear ring 703. The transmission bevel gear ring 703 is used to drive the bevel gear seat 907, the rotating shaft 904 and the wheel frame 905 to rotate. The wheel frame 905 drives the shaft plug 902 to move in the liquid chamber 901 through the spiral track 906. The transmission bevel gear ring 703 is connected with the bevel gear seat 907 through meshing, and controls the bevel gear seat 907, the rotating shaft 904 and the wheel frame 905 (equipped with a universal wheel) to rotate around the same axis. When the wheel frame 905 rotates, it moves along the spiral track 906. The spiral structure of the spiral track 906 (the number of turns of the spiral structure is one turn or less than one turn, when the number of turns of the spiral track 906 is less than one turn, at the bottom of the spiral track 906, A planar structure is provided below the top end to receive the falling wheel frame 905. When the wheel frame 905 moves from the lowest end to the top end of the spiral track 906, the shaft plug 902 overcomes the elastic force of the reset spring 903 and moves downward in the liquid cavity 901. The coolant in the liquid cavity 901 is transported to the transmission column 701 through the infusion tube 908, and then flows from the transmission column 701 into the hollow brush head 801 (close to the belt 203 to absorb the heat on the belt 203). When the wheel frame 905 falls from the top end to the bottom end of the spiral track 906, the reset spring 903 pulls the shaft plug 902 to move upward in the liquid cavity 901, and the coolant flows into the liquid cavity 901 through the infusion tube 908.

[0054] See also Figure 3 , Figure 6-Figure 8 and Fig.12In this embodiment, a linkage component is installed in the body component, the input end of the linkage component is connected to the output end of the transmission component, the transmission component is used to drive the linkage component to move in the body component, an adjustment component is installed on the body component, the input end of the adjustment component is connected to the output end of the linkage component, an exhaust component is installed on the adjustment component, the adjustment component is used to drive the exhaust component to move, and the gas flows between the body component and the exhaust component; the linkage component includes a linkage bevel gear 1001 movably connected in the power bin 101, a linkage flat gear 1002 fixedly connected to the linkage bevel gear 1001, a rocker arm 1003 with one end movably connected to the eccentric position of the linkage flat gear 1002, a support rod 1004 movably connected to the other end of the rocker arm 1003, and a plug 1005 installed on the support rod 1004, the linkage bevel gear 1001 is meshed with the second transmission bevel gear 706 The second transmission bevel gear 706 is used to drive the linkage bevel gear 1001 and the linkage flat gear 1002 to rotate, the linkage flat gear 1002 is used to drive the rocker arm 1003 to swing, the plug 1005 is movably connected in the vertical tube 102, and the rocker arm 1003 drives the plug 1005 to move in the vertical tube 102 through the support rod 1004; the exhaust assembly includes a rotating arm 1101 movably connected to the vertical tube 102, and a rotating arm 1101 installed on the rotating arm 1101 The input bevel gear 1102 and the air outlet plate 1103 on the vertical tube 102 and the air supply pipe 1104 with one end connected to the air outlet plate 1103, and the other end of the air supply pipe 1104 is connected to the vertical tube 102; when the plug 1005 moves downward, the gas flows from the vertical tube 102 into the air outlet plate 1103 through the air supply pipe 1104; when the plug 1005 moves upward, the gas flows from the air outlet plate 1103 into the vertical tube 102 through the air supply pipe 1104;The adjustment component includes a first input spur gear 1201 movably connected to the power bin 101, a second input spur gear 1202 fixedly connected to the first input spur gear 1201, an output spur gear 1203 movably connected to the power bin 101, and an output bevel gear 1204 fixedly connected to the output spur gear 1203. The first input spur gear 1201 is meshed with the linkage spur gear 1002, the second input spur gear 1202 is meshed with the output spur gear 1203, the output bevel gear 1204 is meshed with the input bevel gear 1102, and the linkage spur gear The gear 1002 is used to drive the first input spur gear 1201 and the second input spur gear 1202 to rotate. The second input spur gear 1202 is used to drive the output spur gear 1203 and the output bevel gear 1204 to rotate. The output bevel gear 1204 drives the rotating arm 1101 to rotate through the input bevel gear 1102. The second transmission bevel gear 706 controls the linkage bevel gear 1001 and the linkage spur gear 1002 to rotate together through the meshing transmission effect with the linkage bevel gear 1001. The linkage spur gear 1002 drives the rocker arm 1003 to swing continuously, so that the rocker arm 1101 003 generates a continuous push-pull force on the support rod 1004, which makes the plug 1005 reciprocate up and down in the vertical cylinder 102 (it is worth noting that: through the meshing connection between the input bevel gear 1102 and the first input flat gear 1201, the first input flat gear 1201 and the second input flat gear 1202 can rotate, and then the second input flat gear 1202 rotates to transmit power to the output flat gear 1203, so that the output flat gear 1203 rotates together with the output bevel gear 1204, and the output bevel gear 1204 transmits power to the meshing The linkage flat gear 1002 transmits power in the forward and reverse directions to control the swing arm 1101 to swing in two different directions, so that the air outlet on the air outlet plate 1103 moves toward the ball screw 401 in the opposite direction. When the ball screw 401 moves upward, the swing arm 1101 swings upward, and when the ball screw 401 moves upward, the swing arm 1101 swings downward). When the plug 1005 moves downward, the air in the vertical cylinder 102 flows into the air outlet plate 1103 through the air delivery pipe 1104, and then is discharged from the air outlet plate 1103 and blows toward the ball screw 401 to remove the dust on its surface. ;

[0055] See also Figure 1-Figure 12 In this embodiment, the present invention provides a method for using a duplex CNC machine tool for precise positioning, using a duplex CNC machine tool precise positioning device as described above, including the following steps:

[0056] S1: Start the air pump 311, and input the air in the environment into the air cavity 308 through the air pump 311. The pressure in the air cavity 308 increases, forcing the plunger 309 to overcome the elastic force of the tension spring 310 and move downward. The plunger 309 drives the guide block 305 to slide in the guide groove 304, and makes the locking nut 303 further away from the positioning nut 301, so that the back clearance between the ball in the positioning nut 301 and the ball screw 401 is gradually reduced. At the same time, the electric valve 313 is opened, and the plunger 309 pushes the lubricating grease in another space of the air cavity 308 into the gap between the locking nut 303 and the ball screw 401 through the liquid replenishing tube 312, thereby increasing the lubrication of the ball rolling on the ball screw 401 (the lubricating grease cools and lubricates the surface of the ball screw 401 and the ball, thereby reducing the mechanical wear during operation);

[0057] S2: until the backlash between the ball and the ball screw 401 is reduced to a preset range (eliminating the positioning error caused by the gap during the movement of the ball screw 401), the tension sensor 307 detects that the tension value of the signal spring 306 reaches F1, and the tension sensor 307 feeds back a signal to the control unit of the air pump 311 and the electric valve 313, the air pump 311 stops pumping gas, and the electric valve 313 is closed;

[0058] S3: Place the workpiece to be processed on the corresponding positioning table 501, start the motor 201, and the motor 201 controls one of the driving wheels 202 to rotate, cooperates with the belt 203 and other driving wheels 202, controls the synchronous main gear 204 to rotate continuously, and the synchronous main gear 204 transmits power to the positioning output components in the two lifting warehouses 103 at the same time. Through the meshing transmission of the synchronous main gear 204 and the synchronous sub-gear 302, the positioning nut 301 is controlled to rotate continuously, and under the limited state formed by the guide block 305 and the guide groove 304, the locking nut 303 rotates with the positioning nut 301, driving the two ball screws 401 to lift in the lifting warehouse 103 at the same time (the lubricating grease injected in S3 is entrained to the part where the ball screw 401 passes as the ball rolls on the ball screw 401);

[0059] S4: Synchronous with S3, the synchronous main gear 204 is connected by meshing with the transmission flat gear ring 702 to control the transmission column 701, the transmission flat gear ring 702 and the transmission bevel gear ring 703 to rotate around the same axis, and the transmission bevel gear ring 703 transmits power to the first transmission bevel gear 704 to control the first transmission bevel gear 704, the transmission flat gear 705 and the second transmission bevel gear 706 to rotate around the same axis. The transmission flat gear 705 controls the high-speed rotation of the fan blade 602 through the meshing transmission with the driven gear 601, accelerates the air flow in the power compartment 101, and cools down the various parts of the drive assembly. At the same time, it can also play the role of wind dust removal for the belt 203 (the transmission flat gear ring 702 drives the brush head 801 to pass on the surface of the belt 203, which also plays the role of cleaning dust to a certain extent. The brush head 801 can adopt a structure with dense soft bristles);

[0060] S5: Synchronously with S4, the transmission bevel gear ring 703 transmits power to the bevel gear seat 907, controls the bevel gear seat 907, the rotating shaft 904 and the wheel frame 905 to rotate around the same axis, and the wheel frame 905 moves along the spiral track 906 during rotation. The helical structure of the spiral track 906 (the number of turns of the spiral structure is one turn or less) is used to force the shaft plug 902 to overcome the elastic force of the return spring 903 and reciprocate in the liquid cavity 901. When the shaft plug 902 moves downward, the coolant in the liquid cavity 901 is transported to the transmission column 701 through the infusion tube 908, and then flows from the transmission column 701 into the hollow brush head 801 (a material with good thermal conductivity can be used). The brush head 801 is in contact with and close to the belt 203, so as to absorb the heat generated by the friction of the belt 203.

[0061] S6: Synchronous with S4, the second transmission bevel gear 706 controls the linkage flat gear 1002 to rotate together through the meshing transmission effect with the linkage bevel gear 1001, and the linkage flat gear 1002 drives the rocker arm 1003 to swing continuously, and the rocker arm 1003 generates continuous push-pull force on the support rod 1004. When the plug 1005 moves downward in the vertical tube 102, the air in the vertical tube 102 flows into the air outlet plate 1103 through the air duct 1104, and then is discharged from the air outlet plate 1103 and blows toward the rising ball screw 401 to blow away the dust on its surface (if the dust on the ball screw 401 is removed, the friction resistance of the ball rolling on it will be reduced, further reducing the probability of wear of the ball screw 401 and the ball);

[0062] S7: Synchronous with S6, the input bevel gear 1102 is connected by meshing with the first input spur gear 1201 to control the rotation of the first input spur gear 1201 and the second input spur gear 1202, and then the second input spur gear 1202 rotates to transmit power to the output spur gear 1203, the output spur gear 1203 rotates together with the output bevel gear 1204, the output bevel gear 1204 transmits power to the linked spur gear 1002 meshing with it, and controls the rotating arm 1101 to swing upward, so that the air outlet on the air outlet plate 1103 faces the rising ball screw 401;

[0063] S8: After the workpiece is lifted to a preset height, the motor 201 stops running. At this time, the positioning table 501 and the workpiece are accurately positioned at corresponding heights, and the CNC machine tool processes the workpieces on the two positioning tables 501 at the same time;

[0064] S9: After the workpiece processing is completed, the tension sensor 307 detects the tension value of the signal spring 306 again. At this time, there are two situations. One of the situations is: if the tension value is still F1, the motor 201 is directly started, and the power is output in the opposite direction through the synchronous main gear 204 to control the positioning nut 301 and the locking nut 303 to rotate together, driving the two ball screws 401 to descend in the lifting bin 103 at the same time until the workpiece reaches the preset position; the other situation is: if the tension value is not F1 (during the workpiece processing, due to mechanical vibration, air pump 311, the air cavity 308 leaks, etc., and the gap between the ball screw 401 and the ball may increase again, so the tension value detected is not F1), then repeat the step S1, and control the locking nut 303 to move away from the positioning nut 301 again, so that the gap between the ball in the positioning nut 301 and the wire rail on the ball screw 401 is reduced to the preset range again, until the tension value is detected to be F1, and then the motor 201 is started to drive the two ball screws 401 to descend in the lifting bin 103 at the same time, until the workpiece reaches the preset position;

[0065] S10: During the descent of the ball screw 401, steps S4-S6 are repeated. Meanwhile, according to the method of S7, the input bevel gear 1102 outputs power outward step by step to control the swing arm 1101 to swing downward, so that the air outlet on the air outlet plate 1103 faces the descending ball screw 401.

Claims

1. A double-station CNC machine tool precision positioning device, characterized in that: The device comprises an organism component, a driving component and a positioning output component installed in the organism component, a ball screw (401) movably connected to the positioning output component, and a positioning platform (501) installed on the ball screw (401), wherein the input end of the positioning output component is connected to the output end of the driving component, the driving component is used to drive the positioning output component to rotate, and the positioning output component is used to drive the ball screw (401) to move in a vertical direction; The positioning output assembly comprises a positioning part, a locking part movably connected to the positioning part, and a pre-tightening adjustment part arranged on the positioning part, the pre-tightening adjustment part is used to drive the locking part to approach or move away from the positioning part, and lubricating grease is arranged in the pre-tightening adjustment part. When the locking part moves away from the positioning part, the lubricating grease flows into the back clearance between the positioning output assembly and the ball screw (401); An air blowing assembly and a transmission assembly are installed in the body assembly, a brush head (801) is installed on the transmission assembly, an input end of the air blowing assembly is connected to an output end of the transmission assembly, an input end of the transmission assembly is connected to an output end of the drive assembly, the drive assembly drives the air blowing assembly to rotate through the transmission assembly, and the air blowing assembly is used to accelerate the air flow in the body assembly; An infusion assembly is installed in the body assembly, the infusion assembly is connected to the brush head (801), the input end of the infusion assembly is connected to the output end of the transmission assembly, and a coolant is provided in the infusion assembly, and the coolant can flow between the liquid cylinder assembly and the brush head (801).

2. A duplex CNC machine tool precise positioning device according to claim 1, characterized in that: The machine body assembly comprises a power bin (101), a vertical cylinder (102) mounted on the power bin (101) and two lifting bins (103); the positioning output assembly comprises two and both are movably connected in corresponding lifting bins (103); the ball screws (401) are respectively arranged in the corresponding lifting bins (103); the positioning output assembly is used to drive the ball screws (401) to move along the axis direction of the lifting bins (103); The driving assembly comprises a motor (201) mounted on a power bin (101), a plurality of driving wheels (202) movably connected in the power bin (101), a belt (203) movably connected between the plurality of driving wheels (202), and a synchronous main gear (204) fixedly mounted on one of the driving wheels (202); another driving wheel (202) is mounted on the output end of the motor (201); the motor (201) drives the synchronous main gear (204) to rotate via the driving wheel (202) and the belt (203); the input end of the positioning output assembly is connected to the synchronous main gear (204); the synchronous main gear (204) is used to drive the positioning output assembly to rotate.

3. A duplex CNC machine tool precise positioning device according to claim 2, characterized in that: The positioning part comprises a positioning nut (301) movably connected to the lifting bin (103), a synchronous sub-gear (302) arranged on the positioning nut (301) and a guide groove (304) provided on the positioning nut (301), and the synchronous sub-gear (302) is meshed with the synchronous main gear (204); The locking part comprises a locking nut (303) movably connected to the positioning nut (301) and a guide block (305) fixedly connected to the locking nut (303); the guide block (305) is movably connected in the guide groove (304); the synchronous main gear (204) drives the positioning nut (301) and the locking nut (303) to rotate through the synchronous sub gear (302); The preload adjustment unit comprises an air cavity (308) provided on the positioning nut (301), a tension sensor (307) installed in the air cavity (308), a signal spring (306) connected at one end to the tension sensor (307), a plunger (309) movably connected in the air cavity (308), a tension spring (310) fixedly connected to the plunger (309), an air pump (311) installed on the positioning nut (301), a liquid infusion tube (312) connected at one end to the air cavity (308), and an electric valve (313) installed on the liquid infusion tube (312). The plunger (309) divides the air cavity (308) into two independent spaces, one of which is separated from the air pump (311). ) is connected, the lubricating grease is arranged in another space, one end of the liquid replenishing tube (312) is connected in the space where the lubricating grease is located, and the other end is connected in the back clearance between the locking nut (303) and the ball screw (401), the plunger (309) is fixedly connected to the guide block (305), the gas flows between the air cavity (308) and the air pump (311), the tension sensor (307) is used to detect the tension value of the signal spring (306), when the gas flows into the air cavity (308), the plunger (309) drives the locking nut (303) away from the positioning nut (301) through the guide block (305), and the tension sensor (307) detects that the tension value of the signal spring (306) reaches F1.

4. A duplex CNC machine tool precise positioning device according to claim 3, characterized in that: The air blowing assembly comprises a driven gear (601) movably connected in the power compartment (101) and a fan blade (602) fixedly mounted on the driven gear (601), the driven gear (601) being connected to the output end of the transmission assembly, and the transmission assembly drives the fan blade (602) to rotate through the driven gear (601); The transmission assembly comprises a transmission column (701) movably connected in a power bin (101), a transmission flat gear ring (702) fixedly connected to the transmission column (701), a transmission bevel gear ring (703) arranged on the transmission flat gear ring (702), a first transmission bevel gear (704) movably connected in the power bin (101), a transmission flat gear (705) fixedly connected to the first transmission bevel gear (704) and a second transmission bevel gear (706), the transmission flat gear ring (702) meshes with a synchronous main gear (204), and the first transmission flat gear ring (703) is arranged on the transmission flat gear ring (702). The driven bevel gear (704) is meshed with the transmission bevel gear ring (703); the synchronous main gear (204) is used to drive the transmission column (701), the transmission flat gear ring (702) and the transmission bevel gear ring (703) to rotate; the transmission bevel gear ring (703) is used to drive the first transmission bevel gear (704), the transmission flat gear (705) and the second transmission bevel gear (706) to rotate; the driven gear (601) is meshed with the transmission flat gear (705); the transmission flat gear (705) drives the fan blade (602) to rotate through the driven gear (601).

5. A duplex CNC machine tool precise positioning device according to claim 4, characterized in that: The infusion component comprises a liquid cavity (901) mounted on the body component, a drainage component movably connected in the liquid cavity (901), and a follower component movably connected to the drainage component, the input end of the follower component is connected to the output end of the transmission component, the transmission component is used to drive the follower component to rotate, and the follower component is used to drive the drainage component to move in the liquid cavity (901), an infusion tube (908) is movably connected between the liquid cavity (901) and the transmission column (701), a channel is provided between the transmission column (701) and the brush head (801), and when the drainage component moves in the liquid cavity (901), the cooling liquid flows between the liquid cavity (901) and the brush head (801) through the infusion tube (908).

6. A duplex CNC machine tool precise positioning device according to claim 5, characterized in that: The liquid discharge assembly comprises a shaft plug (902) movably connected in the liquid cavity (901), a return spring (903) installed on the shaft plug (902), and a spiral track (906) installed in the shaft plug (902); one end of the return spring (903) is connected to the shaft plug (902), and the other end is connected to the liquid cavity (901); when the shaft plug (902) moves downward, the cooling liquid flows from the liquid cavity (901) into the brush head (801) through the liquid infusion tube (908); when the shaft plug (902) moves upward, the cooling liquid flows from the brush head (801) into the liquid cavity (901) through the liquid infusion tube (908); The follower assembly comprises a rotating shaft (904) movably connected in the shaft plug (902), a wheel frame (905) fixedly connected to one end of the rotating shaft (904) and a bevel gear seat (907) fixedly connected to the other end of the rotating shaft (904); the wheel frame (905) can move along a spiral track (906); the bevel gear seat (907) is meshed with a transmission bevel gear ring (703); the transmission bevel gear ring (703) is used to drive the bevel gear seat (907), the rotating shaft (904) and the wheel frame (905) to rotate; the wheel frame (905) drives the shaft plug (902) to move in the liquid chamber (901) via the spiral track (906).

7. A duplex CNC machine tool precise positioning device according to claim 6, characterized in that: A linkage component is installed in the body component, and the input end of the linkage component is connected to the output end of the transmission component. The transmission component is used to drive the linkage component to move in the body component. An adjustment component is installed on the body component, and the input end of the adjustment component is connected to the output end of the linkage component. An exhaust component is installed on the adjustment component, and the adjustment component is used to drive the exhaust component to move, and gas flows between the body component and the exhaust component.

8. A double-station CNC machine tool precise positioning device according to claim 7, characterized in that: The linkage assembly comprises a linkage bevel gear (1001) movably connected in a power compartment (101), a linkage flat gear (1002) fixedly connected to the linkage bevel gear (1001), a rocker arm (1003) movably connected at one end to an eccentric position of the linkage flat gear (1002), a support rod (1004) movably connected to the other end of the rocker arm (1003), and a plug (1005) installed on the support rod (1004). 1001) is meshed with the second transmission bevel gear (706), the second transmission bevel gear (706) is used to drive the linkage bevel gear (1001) and the linkage flat gear (1002) to rotate, the linkage flat gear (1002) is used to drive the rocker arm (1003) to swing, the plug (1005) is movably connected in the vertical cylinder (102), and the rocker arm (1003) drives the plug (1005) to move in the vertical cylinder (102) through the support rod (1004); The exhaust assembly comprises a rotating arm (1101) movably connected to the vertical cylinder (102), an input bevel gear (1102) and an air outlet plate (1103) installed on the rotating arm (1101), and an air delivery pipe (1104) having one end connected to the air outlet plate (1103), and the other end of the air delivery pipe (1104) connected to the vertical cylinder (102); When the plug (1005) moves downward, the gas flows from the vertical tube (102) into the air outlet plate (1103) through the air delivery pipe (1104); when the plug (1005) moves upward, the gas flows from the air outlet plate (1103) into the vertical tube (102) through the air delivery pipe (1104).

9. A duplex CNC machine tool precise positioning device according to claim 8, characterized in that: The adjustment component comprises a first input spur gear (1201) movably connected to the power bin (101), a second input spur gear (1202) fixedly connected to the first input spur gear (1201), an output spur gear (1203) movably connected to the power bin (101), and an output bevel gear (1204) fixedly connected to the output spur gear (1203), wherein the first input spur gear (1201) is meshed with the linkage spur gear (1002), and the second input spur gear (1202) is meshed with the linkage spur gear (1002). The output bevel gear (1204) is meshed with the output spur gear (1203), and the output bevel gear (1204) is meshed with the input bevel gear (1102). The linkage spur gear (1002) is used to drive the first input spur gear (1201) and the second input spur gear (1202) to rotate. The second input spur gear (1202) is used to drive the output spur gear (1203) and the output bevel gear (1204) to rotate. The output bevel gear (1204) drives the rotating arm (1101) to rotate through the input bevel gear (1102).

10. A method for precise positioning of a duplex CNC machine tool, characterized in that: The duplex CNC machine tool precision positioning device as claimed in claim 9 comprises the following steps: S1: Start the air pump (311), and input the air in the environment into the air cavity (308) through the air pump (311). The pressure in the air cavity (308) increases, forcing the plunger (309) to overcome the elastic force of the tension spring (310) and move downward. The plunger (309) drives the guide block (305) to slide in the guide groove (304), and makes the locking nut (303) further away from the positioning nut (301), so that the back clearance between the ball in the positioning nut (301) and the ball screw (401) is gradually reduced. At the same time, the electric valve (313) is opened, and the plunger (309) pushes the lubricating grease in another space of the air cavity (308) into the gap between the locking nut (303) and the ball screw (401) through the liquid replenishing tube (312), thereby increasing the lubrication of the ball rolling on the ball screw (401); S2: until the backlash between the ball and the ball screw (401) is reduced to within a preset range, the tension sensor (307) detects that the tension value of the signal spring (306) reaches F1, and the tension sensor (307) feeds back a signal to the control unit of the air pump (311) and the electric valve (313), the air pump (311) stops pumping gas, and the electric valve (313) closes; S3: placing the workpiece to be processed on the corresponding positioning platform (501), starting the motor (201), and the motor (201) controls one of the driving wheels (202) to rotate, cooperates with the belt (203) and the other driving wheels (202), controls the synchronous main gear (204) to rotate continuously, and the synchronous main gear (204) transmits power to the positioning output components in the two lifting bins (103) at the same time, and controls the positioning nut (301) to rotate continuously through the meshing transmission action of the synchronous main gear (204) and the synchronous sub-gear (302). In the limited state formed by the guide block (305) and the guide groove (304), the locking nut (303) rotates together with the positioning nut (301), driving the two ball screws (401) to be lifted in the lifting bin (103) at the same time; S4: Synchronous with S3, the synchronous main gear (204) controls the transmission column (701), the transmission flat gear ring (702) and the transmission bevel gear ring (703) to rotate around the same axis through meshing connection with the transmission flat gear ring (702), and the transmission bevel gear ring (703) transmits power to the first transmission bevel gear (704), controls the first transmission bevel gear (704), the transmission flat gear (705) and the second transmission bevel gear (706) to rotate around the same axis, and the transmission flat gear (705) controls the fan blade (602) to rotate at a high speed through meshing transmission with the driven gear (601), accelerates the air flow in the power compartment (101), and cools down the various parts of the drive assembly with air, and can also achieve the effect of wind dust removal on the belt (203); S5: Synchronously with S4, the transmission bevel gear ring (703) transmits power to the bevel gear seat (907), controls the bevel gear seat (907), the rotating shaft (904) and the wheel frame (905) to rotate around the same axis, and the wheel frame (905) moves along the spiral track (906) during rotation. The helical structure of the spiral track (906) forces the shaft plug (902) to overcome the elastic force of the return spring (903) and reciprocate in the liquid chamber (901). When the shaft plug (902) moves downward, the coolant in the liquid chamber (901) is transported to the transmission column (701) through the infusion tube (908), and then flows from the transmission column (701) into the hollow brush head (801). The brush head (801) and the belt (203) are in contact and close proximity, so as to absorb the heat generated by the friction of the belt (203) during operation. S6: Synchronous with S4, the second transmission bevel gear (706) controls the linkage flat gear (1002) to rotate together through meshing transmission with the linkage bevel gear (1001), and the linkage flat gear (1002) drives the rocker arm (1003) to swing continuously, and the rocker arm (1003) generates continuous push-pull force on the support rod (1004). When the plug (1005) moves downward in the vertical tube (102), the air in the vertical tube (102) flows into the air outlet plate (1103) through the air delivery pipe (1104), and then is discharged from the air outlet plate (1103) and blows toward the rising ball screw (401) to blow away the dust on its surface; S7: Synchronous with S6, the input bevel gear (1102) controls the rotation of the first input spur gear (1201) and the second input spur gear (1202) through meshing connection with the first input spur gear (1201), and then the second input spur gear (1202) rotates to transmit power to the output spur gear (1203), the output spur gear (1203) rotates together with the output bevel gear (1204), and the output bevel gear (1204) transmits power to the linked spur gear (1002) meshing with it, controlling the rotating arm (1101) to swing upward, so that the air outlet on the air outlet plate (1103) faces the rising ball screw (401); S8: After the workpiece is lifted to a preset height, the motor (201) stops running, and the positioning platform (501) and the workpiece are accurately positioned at corresponding heights, and the CNC machine tool processes the workpieces on the two positioning platforms (501) at the same time; S9: After the workpiece processing is completed, the tension sensor (307) detects the tension value of the signal spring (306) again. At this time, there are two situations. One of the situations is: if the tension value is still F1, the motor (201) is directly started, and the power is output in the opposite direction through the synchronous main gear (204), so as to control the positioning nut (301) and the locking nut (303) to rotate together, and drive the two ball screws (401) to descend in the lifting bin (103) at the same time until the workpiece reaches the preset position; the other situation is: if the tension value is not F1, the step of S1 is repeated, and the locking nut (303) is controlled to move away from the positioning nut (301) again, so that the gap between the ball in the positioning nut (301) and the wire rail on the ball screw (401) is reduced to the preset range again, until the tension value is detected to be F1, and then the motor (201) is started, and the two ball screws (401) are driven to descend in the lifting bin (103) at the same time until the workpiece reaches the preset position; S10: During the process of the ball screw (401) descending, steps S4-S6 are repeated. Meanwhile, according to the method of S7, the input bevel gear (1102) outputs power outward step by step to control the rotating arm (1101) to swing downward, so that the air outlet on the air outlet plate (1103) faces the descending ball screw (401).

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